The pictures were chosen by the couple following a photoshoot last month - a week after they had announced their happy news. They were taken in the council chamber of the state apartment of St James's palace.

Peruvian-born Mario, who created some of the most iconic images of William's mother Princess Diana, also photographed the Prince on his 21st birthday in 2003. And a year later, for Harry's 20th birthday, he snapped the royal brothers joking with their father.

Prince Charles posed for a Testino portrait in 2001 and again five years later to mark his first wedding anniversary to Camilla.